US6129865A - Manufacturing method of multifiber connector ferrule for ribbon-type optical cable - Google Patents
Manufacturing method of multifiber connector ferrule for ribbon-type optical cable Download PDFInfo
- Publication number
- US6129865A US6129865A US09/127,560 US12756098A US6129865A US 6129865 A US6129865 A US 6129865A US 12756098 A US12756098 A US 12756098A US 6129865 A US6129865 A US 6129865A
- Authority
- US
- United States
- Prior art keywords
- ferrule
- ferrules
- mold
- core pins
- plane
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/36—Mechanical coupling means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/30—Mounting, exchanging or centering
- B29C33/303—Mounting, exchanging or centering centering mould parts or halves, e.g. during mounting
- B29C33/304—Mounting, exchanging or centering centering mould parts or halves, e.g. during mounting centering cores
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/0033—Moulds or cores; Details thereof or accessories therefor constructed for making articles provided with holes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/42—Moulds or cores; Details thereof or accessories therefor characterised by the shape of the moulding surface, e.g. ribs or grooves
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/68—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts by incorporating or moulding on preformed parts, e.g. inserts or layers, e.g. foam blocks
- B29C70/74—Moulding material on a relatively small portion of the preformed part, e.g. outsert moulding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D11/00—Producing optical elements, e.g. lenses or prisms
- B29D11/0074—Production of other optical elements not provided for in B29D11/00009- B29D11/0073
- B29D11/0075—Connectors for light guides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/02—Transfer moulding, i.e. transferring the required volume of moulding material by a plunger from a "shot" cavity into a mould cavity
Definitions
- the present invention relates to a manufacturing method of ferrules used in an optical connector for connection and short-circuit of multichannel optical signals in optical transmission. More particularly, the present invention relates to a method of maintaining the structure of a mold for transfer molding and the degree of precision which makes it possible to manufacture a high molecular ferrule, a component part of the optical connector, having a tolerance of less than 1 micron so that it sustain a contact loss of less than 1 dB. Such low contact loss is most important performances measures for optical connectors in connection with the development of a multicore optical connectors where connection and short-circuit of multichannel optical signals are required.
- optical fiber connection must be effected very precisely so as to minimize loss.
- an optical connector which is used where permanent connection by a connector and repeated attachment/detachment are required is now used.
- a multicore optical connector is less desirable in terms of loss characteristic when compared to a multicore mechanical splice, but more favorable with respect to adaptability and optical cable connection time. It also is preferred for prompt connection of multicore optical cables.
- Multicore optical connectors developed thus far make use of basic alignment techniques such as: (1) the method of stacking a single core, (2) the method of connection by forming V-grooves in silicon substrate and the (3) method of inserting an optical fiber into a very small hole molded very precisely.
- the first method was developed in Japan and MU (Miniature Unit)-type back panel connector made by reducing big monocore ceramic ferrule to a half is typical.
- This connector does not use an optical fiber array and so it is easy to maintain and repair each line.
- this connector requires precise production technology due to low packaging density and alignment technique using small ferrules and sleeves. Consequently, it gives rise to a relatively great technical difficulty and the price is high.
- the second method was developed in the United States. It is widely known as MAC (Multifiber Array Connector).
- a large number of fine holes which have a diameter of 125 microns and tolerance of less than 1 micron are arranged along a line at regular intervals (pitches) with tolerance of less than 1 micron in a high molecular material for the use of optical fiber and, to align two ferrules facing each other for connection, a cylindrical metal stick (i.e., guide pin) precisely fabricated so as to have a tolerance of not exceeding 1 micron, precise pitches formed in ferrules and a metal pin guide hole are used. Consequently, it is necessary to maintain a very high degree of accuracy. However maintaining such a high degree of accuracy increases production cost and lowers productivity. Thus, it is an important cost factor in building a superspeed information communication network now being installed throughout the world.
- the present invention realizes maintenance of accuracy by reverse direction connection dependent simply on height in a reference plane.
- the present invention provides a manufacturing method of optical connector ferrule for ribbon-type optical cable connection which overcomes a conventional technical difficulty by forming the reference plane according to relatively simple plane processing and adding flow directivity to the inside of the mold so as to make it possible to form fine holes in the reference plane as the method of controlling the accuracy of height.
- the present invention contrived to accomplish said object is characterized by that when fine holes into which optical fibers are to be inserted precisely at regular intervals are arranged within the ferrule, their heights are made to be aligned according to external load with the lower reference plane of the ferrule as the center and, in the case of ferrules molded in the same mold, the ferrules are manufactured by an up and down symmetry-type mold so that relative connection of two ferrules may be situated along a central longitudinal plane of ferrules by selecting the reference plane of another ferrule as the reverse-direction plane.
- An embodiment of the present invention includes a method of making ferrules for multicore ribbon-type optical cable connectors.
- Each of the ferrules has a substantially flat bottom surface defining a reference plane and a substantially flat top surface defining a reverse-direction plane.
- the ferrules are connectable with one another when the reference plane of one of the ferrules is substantially aligned with the reverse-direction plane of another one of the ferrules.
- the method comprises the steps of:
- FIG. 1a shows a ferrule manufactured according to the present invention
- FIG. 1b shows a cross-sectional view taken along line A--A of a ferrule manufactured according to the present invention.
- FIG. 2 is a structural view of a ferrule mold describing the present invention
- FIG. 3 is a conceptual view of parts of the mold having V-grooves so as to realize a high degree of precision which is the major function of the ferrule;
- FIG. 4a shows a whole shape of a mold corex
- FIG. 4b shows a cross-sectional view taken along line C-C' of a mold core.
- the present invention relates to a method of manufacturing a ferrule, an essential component part, for the realization of an optical connector which incurs a low contact loss.
- FIGS. 1a and 1b show a ferrule, a component essential to the optical connector, for connection with optical cables.
- FIG. 1a is a perspective view of a ferrule according to the present invention.
- FIG. 1b is a sectional view taken along line A-A' of the ferrule in which optical fibers are to be arranged.
- the ferrule comprises a ribbon-type optical cable guiding part (1), an adhesive injection part (2), a flange (3) where a spring for generation of binding power is to be fixed and fine holes (4) into which precisely arranged optical fibers are to be inserted.
- An optical signal transmitted to the core of an optical fiber inserted fixedly into the ferrule having many fine holes with pitches (5) and diameters (6) formed precisely under 1 micron is transmitted at a very low loss from one side to the other side. Such a low loss is controlled by alignment according to load with the reference plane (7) of the ferrule as the center.
- FIG. 2 is a structural view of a ferrule mold describing the present invention.
- resin is made to flow inside a mold by applying pressure to the material at a high temperature with a transfer molding device.
- the mold is divided into an upper and a lower portion so that a parting line may not affect the alignment of ferrules.
- gate is situated so as to produce symmetric pressure.
- the upper clamping core (10) and the lower clamping core (18) are formed.
- the upper chamfer core (11) and the lower chamfer core (19) are installed by connecting them to said clamping cores (10, 18).
- the upper frontal body core (12) is installed by connecting it to said upper chamfer core (11).
- An injection mouth core (13) to inject high molecular resin is installed in succession.
- the upper rear core (15) and the lower rear core (22) are installed successively to said upper and lower flange cores (14, 21).
- a cut-off cover is installed in succession.
- a molding process about 30 minutes are maintained so that high molecular resin may be hardened within the mold and core pins are removed by the operation of slide cores (16, 17) after molding and a ferrule is manufactured.
- the mold is simply structured by reducing the number of components so that precise processing may be easy. To improve assemblage, tolerance is allowed within the limits of not affecting the accuracy of the ferrule.
- FIG. 3 is a schematic view of parts of a mold having V-grooves so as to obtain a high degree of precision which is the major function of the ferrule.
- V-grooves (25) are formed at a pitch of 250 microns. The pitch is maintained by situating a core pin (27) installed within a core pin fixing block (26) in the V-groove (25).
- the height of ferrules can be made uniform if the lower portion (28), which is a reference plane for installation of core pins, is maintained at an accuracy under micron by plane processing.
- the core pins received within the V-grooves in the mold have a gap of about several microns.
- the core pin constitutes a nonalignment factor two times as great as deflection of reference line and raises a loss when united in an opposite direction, and so a gate is situated in order that flowing force within the mold may vertically act on the lower type. This method is realized if high molecular material flowing in through the gate is turned upward.
- FIGS. 4a and 4b show the shape of a mold core.
- FIG. 4a is a whole shape and FIG. 4b are sectional views taken along B-B' line and C-C' line.
- the core pin For the core pin, its diameter, the length of molding part, a method of fixing it to the mold and the curved surface of guiding groove are important. It is transformed into three steps.
- Mold fixing portion (31) .0.750 ⁇ m
- the core pin is preferably made of tungsten carbide the size of its grains is less than 0.5 ⁇ m. It is fabricated by means of a grinder.
- pitch accuracy maintenance technique pitch is made so as to secure its accuracy by forming the structure of mold and core pin independently.
- V-grooves in which core pins are to be installed are processed by precise grinding in the mold and the guiding groove molding part of core pin itself is manufactured to 250 ⁇ 1 ⁇ m.
- a rough pitch can be maintained by installing the core pin in the mold as a first step and a precise pitch is maintainable by installing it in the V-groove as a second step.
- the present invention provided a has realized the ferrule, a component essential to a multicore optical connector to be used in large numbers an optical communication system and line, by means of a new structure and a new manufacturing method. It has adopted reverse-direction reference plane connection structure by forming an up and down symmetry type connection plane in order to reduce dependence on ultraprecise molding technique, which is a difficulty suffered by high molecular material.
- the lower type plane is changed to a plane type which can be relatively easily processed for the precise arrangement of fine holes, so that production can be stabilized and the ferrule can be manufactured on a commercial basis. Consequently, it is also possible to lower the price of a multicore optical connector.
Abstract
Description
Claims (7)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR97-61594 | 1997-11-20 | ||
KR1019970061594A KR100261307B1 (en) | 1997-11-20 | 1997-11-20 | Manufacturing method of multifiber connector ferrule for ribbon-type optical cable |
Publications (1)
Publication Number | Publication Date |
---|---|
US6129865A true US6129865A (en) | 2000-10-10 |
Family
ID=19525204
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/127,560 Expired - Lifetime US6129865A (en) | 1997-11-20 | 1998-07-31 | Manufacturing method of multifiber connector ferrule for ribbon-type optical cable |
Country Status (2)
Country | Link |
---|---|
US (1) | US6129865A (en) |
KR (1) | KR100261307B1 (en) |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20030002801A1 (en) * | 2001-06-22 | 2003-01-02 | Bookham Technology Plc | System |
US6547449B1 (en) * | 1999-12-17 | 2003-04-15 | Corning Cable Systems Llc | Windowless, rectangular ferrule in a preassembled multifiber connector and associated assembly method |
US20030235374A1 (en) * | 2002-06-24 | 2003-12-25 | Corning Cable Systems Llc | Ferrule assembly having highly protruding optical fibers and an associated fabrication method |
US6688780B2 (en) | 2002-02-07 | 2004-02-10 | Amphenol Corporation | Cantilevered shutter for optical adapter |
US20040126069A1 (en) * | 2002-12-30 | 2004-07-01 | Jong Michael De | Flexible, multi-fiber fiber optic jumper |
US20100067852A1 (en) * | 2008-09-18 | 2010-03-18 | International Business Machines Corporation | Method for assembling a furrule for an optical wave guide connector, ferrule, wave guide ribbon and tool for assembling the ferrule |
US20110044585A1 (en) * | 2008-12-11 | 2011-02-24 | Afl Telecommunications Llc | "secured" fiber optic connecting system and method using offset fiber position in a single-fiber connector |
US20110064361A1 (en) * | 2008-12-11 | 2011-03-17 | Afl Telecommunications Llc | "secured" fiber optic connecting system and method using different fiber positions of a multi-fiber connector |
US20110075973A1 (en) * | 2009-09-30 | 2011-03-31 | Dean Jr David L | Tapered-Channel Ferrules and Optical Fiber Connectors Employing Same |
US20110262582A1 (en) * | 2010-04-21 | 2011-10-27 | Hon Hai Precision Industry Co., Ltd. | Apparatus for molding optical fiber connector |
US20130195406A1 (en) * | 2012-01-30 | 2013-08-01 | Terry L. Cooke | Overmolded ferrule boot and methods for making the same |
US9140861B2 (en) | 2013-03-14 | 2015-09-22 | Avago Technologies General Ip (Singapore) Pte. Ltd. | Optical connector having stepped alignment pins |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5441397A (en) * | 1993-06-01 | 1995-08-15 | Telefonaktiebolaget Lm Ericsson | Mold arrangement for optodevices |
US5603870A (en) * | 1993-02-22 | 1997-02-18 | Lucent Technologies Inc. | Optical fiber connector techniques |
US5620634A (en) * | 1995-08-17 | 1997-04-15 | Lucent Technologies Inc. | Method of making fiber waveguide connectors |
US5707565A (en) * | 1994-10-07 | 1998-01-13 | The Furukawa Electric Co., Ltd. | Method and apparatus for manufacturing a ferrule |
US5780079A (en) * | 1995-08-01 | 1998-07-14 | Daewoo Telecom Ltd. | Apparatus for molding a connector |
-
1997
- 1997-11-20 KR KR1019970061594A patent/KR100261307B1/en not_active IP Right Cessation
-
1998
- 1998-07-31 US US09/127,560 patent/US6129865A/en not_active Expired - Lifetime
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5603870A (en) * | 1993-02-22 | 1997-02-18 | Lucent Technologies Inc. | Optical fiber connector techniques |
US5441397A (en) * | 1993-06-01 | 1995-08-15 | Telefonaktiebolaget Lm Ericsson | Mold arrangement for optodevices |
US5707565A (en) * | 1994-10-07 | 1998-01-13 | The Furukawa Electric Co., Ltd. | Method and apparatus for manufacturing a ferrule |
US5780079A (en) * | 1995-08-01 | 1998-07-14 | Daewoo Telecom Ltd. | Apparatus for molding a connector |
US5620634A (en) * | 1995-08-17 | 1997-04-15 | Lucent Technologies Inc. | Method of making fiber waveguide connectors |
Non-Patent Citations (4)
Title |
---|
"MT Multifiber Connectors and New Applications," Toshiaki Satake, Toru Arikawa, P. William Blubaugh, Craig Parsons*, and Toshi K. Uchida, IEEE 1994, pp. 994-999. |
"Multifiber Optical Components for Subscriber Networks," Hiroshi Yokosuka, Hariharan Naidu, Hideyuki Hosoya and Yoshi Kikuchi, Electronic Components and Technology Conference 1996, pp. 487-493. |
MT Multifiber Connectors and New Applications, Toshiaki Satake, Toru Arikawa, P. William Blubaugh, Craig Parsons*, and Toshi K. Uchida, IEEE 1994, pp. 994 999. * |
Multifiber Optical Components for Subscriber Networks, Hiroshi Yokosuka, Hariharan Naidu, Hideyuki Hosoya and Yoshi Kikuchi, Electronic Components and Technology Conference 1996, pp. 487 493. * |
Cited By (22)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6547449B1 (en) * | 1999-12-17 | 2003-04-15 | Corning Cable Systems Llc | Windowless, rectangular ferrule in a preassembled multifiber connector and associated assembly method |
US20030002801A1 (en) * | 2001-06-22 | 2003-01-02 | Bookham Technology Plc | System |
US6893162B2 (en) * | 2001-06-22 | 2005-05-17 | Bookham Technology Plc | System |
US6688780B2 (en) | 2002-02-07 | 2004-02-10 | Amphenol Corporation | Cantilevered shutter for optical adapter |
US20030235374A1 (en) * | 2002-06-24 | 2003-12-25 | Corning Cable Systems Llc | Ferrule assembly having highly protruding optical fibers and an associated fabrication method |
US6957920B2 (en) * | 2002-06-24 | 2005-10-25 | Corning Cable Systems Llc | Ferrule assembly having highly protruding optical fibers and an associated fabrication method |
US20040126069A1 (en) * | 2002-12-30 | 2004-07-01 | Jong Michael De | Flexible, multi-fiber fiber optic jumper |
US6764221B1 (en) * | 2002-12-30 | 2004-07-20 | Corning Calde Systems Llc | Flexible, multi-fiber fiber optic jumper |
WO2004061509A1 (en) * | 2002-12-30 | 2004-07-22 | Corning Cable Systems | Flexible, multi-fiber optic jumper |
US20100067852A1 (en) * | 2008-09-18 | 2010-03-18 | International Business Machines Corporation | Method for assembling a furrule for an optical wave guide connector, ferrule, wave guide ribbon and tool for assembling the ferrule |
US20110044585A1 (en) * | 2008-12-11 | 2011-02-24 | Afl Telecommunications Llc | "secured" fiber optic connecting system and method using offset fiber position in a single-fiber connector |
US20110064361A1 (en) * | 2008-12-11 | 2011-03-17 | Afl Telecommunications Llc | "secured" fiber optic connecting system and method using different fiber positions of a multi-fiber connector |
US8419292B2 (en) | 2008-12-11 | 2013-04-16 | Afl Telecommunications Llc | “Secured” fiber optic connecting system and method using different fiber positions of a multi-fiber connector |
US8662759B2 (en) | 2008-12-11 | 2014-03-04 | Afl Telecommunications Llc | “Secured” fiber optic connecting system and method using different fiber positions of a multi-fiber connector |
US9195011B2 (en) | 2008-12-11 | 2015-11-24 | Afl Telecommunications Llc | “Secured” fiber optic connecting system and method using offset fiber position in a single-fiber connector |
US20110075973A1 (en) * | 2009-09-30 | 2011-03-31 | Dean Jr David L | Tapered-Channel Ferrules and Optical Fiber Connectors Employing Same |
US8337095B2 (en) * | 2009-09-30 | 2012-12-25 | Corning Cable Systems Llc | Tapered-channel ferrules and optical fiber connectors employing same |
US20110262582A1 (en) * | 2010-04-21 | 2011-10-27 | Hon Hai Precision Industry Co., Ltd. | Apparatus for molding optical fiber connector |
US8459979B2 (en) * | 2010-04-21 | 2013-06-11 | Hon Hai Precision Industry Co., Ltd. | Apparatus for molding optical fiber connector |
US20130195406A1 (en) * | 2012-01-30 | 2013-08-01 | Terry L. Cooke | Overmolded ferrule boot and methods for making the same |
US8678668B2 (en) * | 2012-01-30 | 2014-03-25 | Corning Cable Systems Llc | Overmolded ferrule boot and methods for making the same |
US9140861B2 (en) | 2013-03-14 | 2015-09-22 | Avago Technologies General Ip (Singapore) Pte. Ltd. | Optical connector having stepped alignment pins |
Also Published As
Publication number | Publication date |
---|---|
KR19990041063A (en) | 1999-06-15 |
KR100261307B1 (en) | 2000-07-01 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP0249237B1 (en) | Optical connector ferrule | |
US5613024A (en) | Alignment of optical fiber arrays to optical integrated circuits | |
US6986608B2 (en) | Passive alignment connection for fiber optics | |
EP0895106B1 (en) | Method of fabricating a fiber optic connector ferrule | |
US5706378A (en) | Method of production of optical waveguide module | |
US6129865A (en) | Manufacturing method of multifiber connector ferrule for ribbon-type optical cable | |
US20100247042A1 (en) | Optical connector and fiber module | |
US11852870B2 (en) | Optical fiber photonic integrated chip connector interfaces, photonic integrated chip assemblies, and methods of fabricating the same | |
US6210047B1 (en) | Method of fabricating a fiber optic connector ferrule | |
JP2719353B2 (en) | Multi-core optical terminal | |
EP0896235B1 (en) | Fiber optic connector ferrule | |
US7149400B2 (en) | Ferrule assembly for optical fibres | |
EP0895108B1 (en) | Alignment system for a fiber optic connector ferrule | |
JP2005517966A (en) | High density optical fiber array | |
US6342170B1 (en) | Fabrication method and forming mold for multi-fiber optical-connector ferrules | |
KR19980016218A (en) | Multi-fiber connector | |
EP1223445A1 (en) | Apparatus and method for interconnecting multi-dimensional optical fiber arrays | |
US6542676B2 (en) | Method for locating a large number of fibre ends in a pre-determined position | |
JPH09166724A (en) | Manufacture of optical waveguide module | |
JPS61209404A (en) | Manufacture of multicore optical fiber connector | |
KR100403668B1 (en) | Mold for molding an optical fiber connecting device and a method for fabricating the device using the same | |
KR20010066208A (en) | Optical fiber block for connecting fibers to planar waveguide device, manufacturing method and apparatus thereof | |
KR960007886B1 (en) | Optical connector | |
JP2635189B2 (en) | Method for manufacturing multi-core optical connector | |
KR100280329B1 (en) | Multi-optical connectors and multi-conductor connectors using plastic multi-conductor connector ferrules |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: KOREA TELECOM, KOREA, REPUBLIC OF Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:JUNG, MYUNG YUNG;CHUN, OH GONE;AHN, SEUNG HO;AND OTHERS;REEL/FRAME:009359/0907 Effective date: 19980709 Owner name: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTIT Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:JUNG, MYUNG YUNG;CHUN, OH GONE;AHN, SEUNG HO;AND OTHERS;REEL/FRAME:009359/0907 Effective date: 19980709 |
|
STCF | Information on status: patent grant |
Free format text: PATENTED CASE |
|
FEPP | Fee payment procedure |
Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY |
|
FPAY | Fee payment |
Year of fee payment: 4 |
|
FPAY | Fee payment |
Year of fee payment: 8 |
|
FEPP | Fee payment procedure |
Free format text: PAYER NUMBER DE-ASSIGNED (ORIGINAL EVENT CODE: RMPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY |
|
FPAY | Fee payment |
Year of fee payment: 12 |